SPECIFICATIONS_lakota 1 .pdf

00050 - 1

U. S. Department of Agriculture Forest Service - Region 2

SECTION 00050

LAKOTA LAKE SEDIMENT REMOVAL

PART I - GENERAL

1.1 Scope - This project shall consist of diverting water through Lakota Lake during construction period, placing a small quantity of riprap and rock steps, dredging sediments from the reservoir, stockpiling in sediment disposal area and reshaping stockpiled sediment at a later date.

1.2 Related Work - The work shall be in accordance with the following subsidiary specifications.

The subsidiary specifications are referred to in the text by the Section designation only.

Section 00100 Measurement and Payment Section 00190 Mobilization Section 01170 Safety Section 02135A Sediment Removal Section 02135B Reshaping Stockpile Section 02205A Riprap Rock Section 02205B Rock Steps Section 02215 Dewatering and Water Control

Section 02240 Crushed Aggregate Section 02370 Sediment and Erosion Control Measures Section 02825 Seeding and Mulching

PART II - PRODUCTS - Not Applicable

PART III - EXECUTION

3.1 Contract Time – The contract will be awarded in the Fall of 2014. The Forest Service will drain the lake in early Fall to allow the lake to dry out before it freezes. The Contractor will be expected to start work as soon as the lake bottom is froozen allowing equipment to operate in the lake bottom. Rehabilitating the haul road shall be completed by May 15, 2015. Contract time will be 150 days.

3.2 Public Protection – The picnic ground will be closed and the contractor will be allowed to exclude the public from the work site throughout the project. Furnishing, installation, and maintenance of all barricades, signage, and other measures necessary to exclude and protect the public will be the responsibility of the Contractor and must be approved in advance by the C.O..

3.3 Sanitary Facilities – It will be the contractors responsiblitiy to provide sanitary facilities as required for crew use.

3.4 Haul Route and Load Restrictions – The haul road shall be constructed as per Section 2240 and rehabilitated as per Section 2135A.

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3.5 Protection of Improvements – It will be the contractor’s responsibility to protect all existing improvements including but not limited to: existing roads and trails, picnic tables and grills.

3.6 Permits – The Forest Service will obtain a 404 permit for the project. The terms of the 404 permit will be given to the contractor who will be expected to meet the requirements of the permit. All other permits including a stormwater construction permit for disposal sites will be the contractors responsibility. A stormwater construction permit may be obtained at the following web site: http://denr.sd.gov/des/sw/stormwater.aspx

3.7 Equipment and Material Cleaning for Aquatic Nuisance Species - In order to prevent the introduction or spread of aquatic nuisance species (ANS) and the yellow grub (Clinostomum complanatum; found in Bismarck and Lakota Lakes), all equipment and other materials, i.e.

bypass pipe, etc., that may come in contact with stream/lake water or dredge spoils should be inspected, cleaned, drained, disinfected, or completely dried prior to use on this project and after use. However, if the contractor can prove/verify that the equipment was not used in another waterbody 10 days prior to use in Lakota Lake, cleaning for ANS species will not be required before use. Cleaning equipment for weeds will still be required as per Section H Special Contract Requirements within the contract.

3.8 The following methods for cleaning equipment for ANS Species are acceptable:

a. Remove all mud and debris from equipment (tracks, turrets, buckets, drags, teeth, bypass pipe, etc.) and keep the equipment dry for 10 days prior to use; or

b. Remove all mud and debris from equipment (tracks, turrets, buckets, drags, teeth, bypass pipe, etc.) and spray/soak equipment with water greater than 140 degrees F for at least 10 minutes;

c. Remove all mud and debris from equipment (tracks, turrets, buckets, drags, teeth, bypass pipe, etc.) and spray/soak equipment with either a 1:1 solution of Formula 409 Household Cleaner and water, or a quaternary ammonia compound (QAC) solution (see table below). Treated equipment must be kept moist for at least 10 minutes.

Table 1. Commercially available QAC disinfectants, percent (%) active QAC, percent QAC concentration in solution, and amount of disinfectant recommended (ml and ounces) per gallon of water to obtain a full kill of invasive aquatic organisms. NOTE: 6 ounces disinfectant per gallon equates to a ratio of QAC to water of 1:21.

Disinfectant Name % Active QAC

(MSDS)

% QAC Conc.

In Solution ml per gal Ounces per gal

Quat 4 10.0 0.47 177.5 6.0 Super HDQ Neutral 16.9 0.79 177.5 6.0 Green Solutions (GS) High Dilution Disinfectant 256

21.7 1.0 177.5 6.0

Vedco 128 8.45 0.40 177.5 6.0 Quat 128 8.45 0.40 177.5 6.0

3.8.1 Upon completion of contract all equipment shall be cleaned as specified above. The CO will inspect equipment at site of cleaning.

00100 - 1

U.S. Department of Agriculture

SECTION 00100

MEASUREMENT AND PAYMENT

PART I - GENERAL

1.01 Measurement and Payment - Measurement and payment for contract work will be made only for and under those pay items included in the SCHEDULE OF ITEMS. All other work and materials will be considered as included in the payment for items shown.

When more than one class, size, or thickness is specified in the SCHEDULE OF ITEMS for any pay item, suffixes will be added to the item number to differentiate between items to be bid.

1.02 Determination of Quantities - The following methods of measurement are used to determine contract quantities for payment.

For individual construction items, longitudinal and lateral measurements for area computations will be made horizontally or corrected to horizontal measurement unless otherwise specified.

Measurements for seeding, mulching, geotextiles, netting, erosion control blankets, and sodding will be along slope lines.

The average end area method will be used to compute volumes of excavation or embankment.

However, if in the judgment of the Engineer, the average end area method is impractical, measurement will be made by volume in hauling vehicles or by other three dimensional methods.

Structures will be measured according to neat lines SHOWN ON THE DRAWINGS or as altered by the Engineer in writing to fit field conditions.

For items that are measured by the linear foot, such as pipe culverts, fencing, guardrail, and under drains, measurements will be made parallel to the base or foundation upon which the structures are placed. Pipe and pipe arch culverts shall be measured along center of invert;

arches shall be measured at spring line.

1.03 Units of Measurement - Payment will be by units defined and determined according to U.S.

Standard measure as follows:

A. Cubic Yard – (CY) A measurement computed by one of the following methods:

1. Excavation, Embankment, or Borrow - The measurement computed by the average end area method from measurements made longitudinally along a centerline or reference line.

2. Material in Place or Stockpile - The measurement computed with dimensions of the in-place material.

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3. Material in the Delivery Vehicle - The measurement computed using measurements of material in the hauling vehicles at the point of delivery.

Vehicles shall be loaded to at least their water level capacity. Leveling of the loads may be required when vehicles arrive at the delivery point.

B. Each (EA) - One complete unit, which may consist of one or more parts.

C. Lump Sum (LS) – The bid amount is complete for all work described in the contract and necessary to complete the work for the item.

1.04 Methods of Measurement - One of the following methods of measurement for determining final payment is DESIGNATED on the SCHEDULE OF ITEMS for each pay item:

A. Designed Quantities (DQ) - These quantities denote the final number of units to be paid for under the terms of the contract. They are based upon the original design data available prior to advertising the project. Original design data include the preliminary survey information, design assumptions, calculations, drawings, and the presentation in the contract. Changes in the number of units SHOWN in the SCHEDULE OF ITEMS may be authorized under any of the following conditions:

1. As a result of changes in the work authorized by the Contracting Officer.

2. As a result of the Contracting Officer determining that errors exist in the original design data used to determine designed quantities, that cause a pay item to change by 15 percent or more.

3. As a result of the Contractor submitting to the Contracting Officer a written request showing evidence of errors in the original design data used to determine design quantities that cause a pay item total to change by 15 percent or more. The evidence must be verifiable and consist of calculations, drawings, or other data that show how the designed quantity is believed to be in error.

B. Staked Quantities (SQ) - These quantities are determined from staked measurements prior to construction.

C. Actual Quantities (AQ) - These quantities are determined from measurements of completed work.

D. Vehicle Quantities (VQ) - These quantities are measured or weighed in hauling vehicles.

E. Lump Sum Quantities (LSQ) - These quantities denote one complete unit of work as required by or described in the contract, including necessary materials, equipment, and labor to complete the job. They will not be measured.

END OF SECTION

SECTION 00190

MOBILIZATION

PART I - GENERAL

1.1 Scope - This item is intended to compensate the Contractor for operations including, but not limited to, those necessary for the movement of personnel, equipment, supplies, and incidentals to the project site; for payment of premiums for bonds and insurance for the project; and for any other work and operations which must be performed or costs that must be incurred incident to the initiation of meaningful work at the site and for which payment is not otherwise provided for under the contract.

1.2 Method of Measurement – Payment shall be at the lump sum price shown on the schedule of items.

1.3 Basis of Payment - The lump sum price shall include full compensation for mobilization.

Progress payments for mobilization will be made as follows:

A. Bond premiums will be reimbursed after receipt of the evidence of payment.

B. When 5 percent of the original contract amount is earned from other bid items, 50 percent of the mobilization item, or 5 percent of the original contract amount, whichever is less, will be paid.

C. When 10 percent of the original contract amount is earned from other bid items, 95 percent of the mobilization item, or 10 percent of the original contract amount, whichever is less, will be paid.

D. The remaining 5 % of the mobilization item will be paid after final acceptance of Item 3

Reshaping Stockpile.

PART II - PRODUCTS (Not Applicable)

PART III - EXECUTION (Not Applicable)

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01170 - 1

SECTION 01170

SAFETY

PART I – GENERAL

Compliance with the Occupational Safety and Health Administration (OSHA) regulations for construction safety (29 CFR part 1926 and 29 CFR part 1910) is required as part of this contract, as stated in Section I (Contract Clauses), FAR 52.236-13. The following additional specific requirements also apply to the work performed under this contract:

1. Pre-Work Safety Meeting: A meeting to discuss the Contractor’s planned operations, types of equipment to be used, and particular safety hazards associated with the work must be held prior to work beginning at the site. At this meeting, the COR will designate the limits of the “Work Area”, for the purpose of restricting access and protective gear requirements. This can be accomplished at the pre-work meeting.

2. Safety Plan Submittal: The Contractor shall submit a Safety Plan a minimum of

10 calendar days prior to the Pre-Work Safety Meeting. The Safety Plan shall cover the following information, at a minimum:

a. Emergency Plan & Personnel: Describe local services to be used in the event of emergency medical needs. Provide the name of persons on site who hold a current first aid card.

b. Equipment: List each piece of equipment to be used for the work. This list will be updated as work progresses.

c. Operations: Description of the activities requiring the greatest attention to safety, and how safety will be addressed.

3. Work Area Requirements: Included but not limited to:

a. Head Protection: All personnel must wear hard hats when within the designated Work Area. This includes Contractor employees and visitors.

b. Trench shoring, safety boxes, ladders etc. as required by OSHA during operations requiring holes or trenches.

c. Safety equipment such as flotation devices and safety lines when working over, in or around water.

d. All requirements set by OSHA, MSHA, state and federal regulations. For more information go to www.osha.gov

02135 - 1

SECTION 02135A

SEDIMENT REMOVAL

PART I - GENERAL

1.01 Scope – Perform all work necessary to, excavate, load, haul and stockpile sediment as shown in the drawings into the disposal site.

1.02 Measurement and Payment – Quantity shall be measured as loose cubic yards measured in the stockpile. Quantity shall be established by surveying the sediment disposal site prior to and after placement of dredged material. Survey will be accomplished by the Government. Contractor shall keep track of the number of loads of sediment hauled and inform the Government when they estimate the contract quantity of sediment has been hauled. Government will verify quantity and approve or require additional quantity as appropriate. Payment shall be made at the unit quantity price shown on the schedule of items. Such payment shall be full compensation for excavation, loading, hauling and stockpiling of the sediment, grading and shaping reservoir bottom after completion of dredging activities.

3.01 The sediment disposal site boundary will be staked by the CO.

3.02 Construct access road to lake as per Section 02240.

3.03 Lakeside vegetation – Take care to preserve existing bankside vegetation from excavation, compaction or other damage. Route equipment and trucks to avoid lake edges and vegetation.

Preserve a 10’ buffer of lake shore vegetation in locations staked by the CO.

3.04 Before installation of diversion pipe excavate sediment along the East shoreline. By doing this an area will be created for installation of the diversion pipe along the the East shoreline as shown on drawings.

3.05 Install diversion pipe along the East shoreline before hauling any sediment to sediment disposal site as per Section 02215.

3.06 Excavate in a systematic fashion to depths approved in the field by the CO. Maintain surface drainage on reservoir bottom to allow for local drainage to the dewatering point.

3.07 Control discharge of turbid water from the work area and completed excavations to maintain downstream water quality. Provide filtering as required.

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3.08 In freezing conditions, avoid loading ice with sediments and placing in stockpile. If ice is observed in stockpile, deduction will be made from estimated payment and final payment will be made after summer melt and settlement.

3.09 Utilize the disposal site areas as much as possible by dumping each load of sediment as close to the previous load as possible. After sediment freezes or whenever possible push sediment into a pile to allow space for additional sediment to be stockpiled.

3.10 Upon completion of haul to disposal site.

1. Reinstall picnic table and grill at location staked by the CO.

2. Rehabilitate haul road by removing aggregate and placing behind riprap, filling ruts in haul road with sediment removed from the lake, recontouring road as approved by the CO, seeding and placing erosion control blanket as per section 02825. This work shall be completed before May 15, 2015.

02135 - 1

SECTION 02135B

RESHAPING STOCKPILE

PART I - GENERAL

1.01 Scope – Perform all work necessary to spread sediment into the disposal site.

1.02 Measurement and Payment – Payment shall be at the lump sum price shown on the schedule of items. Such payment shall be full compensation for the work required.

3.01 When conditions are favorable contractor shall push sediment into a rough uniform pile as approved by the CO. Fill slopes of the final pile shall be approximately 4:1. Height will vary depending on quantity hauled to disposal site.

3.02 Uniformly spread slash and trees, obtained from clearing the disposal site, over the disposal site area to a maximum height of 18”.

3.03 Seed as per Section 02825.

02205A - 1

SECTION 02205A

RIPRAP ROCK

PART I - GENERAL

1.01 Scope – The work under this section covers furnishing and installation of a base layer of aggregate and riprap rock.

1.02 Measurement and Payment – Payment shall be at the cubic yard price shown on the schedule of items for Riprap Rock and shall include riprap and bedding.

PART II - PRODUCTS

2.01.1 Riprap Rock - Stone used for machine placed riprap rocks shall be hard, durable and relatively free of dirt. Riprap rock source is near sediment disposal site. Riprap rocks shall have a minimum size of 2’ x 2’ x 2’ or equivalent to approximately 1/2 C.Y. each.

2.02 Riprap Bedding - Bedding aggregate shall be 8” depth Grading G.

3.01 Excavate area for placement of riprap bedding and riprap as shown on the drawing.

3.02 Place riprap bedding layer in a method which will not segregate the material and equipment compact as approved by the CO. The surface of the bedding layer shall be reasonably even and free of mounds or windrows.

3.03 Machine place riprap rocks on the prepared slope. Place rocks tight against each other to minimize the gap between rocks as much as possible.

02205 - 1

SECTION 02205B

ROCK STEPS

PART I - GENERAL

1.01 Scope – The work under this section covers furnishing and installation of rock steps.

1.02 Measurement and Payment – Payment shall be at the each price shown on the schedule of items for Rock Steps.

PART II - PRODUCTS

2.01.1 Step Rock - Stone used for rock steps shall be hard and durable. Rock source is commercial.

Rocks from commercial source shall be relatively flat on two sides, hard and durable, quartzite or granite material. An acceptable source of this rock is called Gold Creek Rock available at Dakota Stone in Hill City.

2.02 Rock size shall be approximately 1’to 2’ thick x 4’to 6’ wide and long.

2.02.1 Top rock steps shall be relatively flat on both sides. Bottom rock step shall be flat on one side.

2.02.2 Elevation difference from top rock to bottom rock shall be approximately 5’ as shown on the drawings.

3.01 Location for rock steps will be staked by the CO.

3.02 Place rocks in such a manner that 1/2-1/3 of upper rock rest on lower rock and rocks are stable.

02215 - 1

SECTION 02215

DEWATERING AND WATER CONTROL

PART I - GENERAL

1.1 Scope – Perform all work necessary to divert, bypass, and route stream flow through the reservoir and dam during construction, and to accomplish removal of surface water and ground water as necessary to perform the construction required by the contract in accordance with the specifications. It shall include: (1) constructing, installing, building, and maintaining all necessary temporary water containment facilities, channels, and diversions; (2) furnishing and installing 36” dia. ADS culvert, installing, and operating all necessary pumps, other piping and other facilities and equipment; and (3) removing all such temporary works and equipment after their intended function is no longer required.

1.2 Measurement and Payment - Payment shall be at the lump sum price shown on the schedule of items. Such payment shall be full compensation for the work required.

PART II – PRODUCTS

The government will furnish, for the contractors use approximately 400’ of used 36” dia. ADS pipe. The pipe is stockpiled at the Game Fish and Parks site on Christianson road in Spearfish

SD.

In addition the contractor will need to provide the following:

36” dia. ADS duel wall culvert N12 ST/IB Total = 30 (20’ sections = 600’) 36” N12 Spigot Gaskets Total = 60

Culvert shall become the property of the USDA Forest Service upon completion of the contract and will be hauled and stockpiled at the Game Fish and Parks site on Christianson road in Spearfish SD.

3.1 Water Control Plan Submittal - The contractor shall furnish the contracting officer, in writing, a proposed plan for meeting the requirements of this section before beginning any construction activities. Acceptance of this plan by the C.O. or the waiving of the plan requirement will not relieve the contractor of the responsibilities related to this activity during the process of completing the work as specified.

3.2 Safety, Shoring, and Protection - The Contractor shall meet the General Safety Orders of the

State encompassing this project and the provisions of the Occupational Safety and Health Administration (OSHA): 29 CFR Part 1926.650-652. Walls and cofferdams shall be supported by bracing, shoring, or other methods and shall be properly located and of sufficient size to accommodate shoring and bracing and to allow for proper installation of the work.

02215 - 2

3.3 Drawdown of Reservoir - The Forest Service will open the existing gate and slowly drawdown the reservoir. A residual pool of water may remain in the reservoir. No sediment will be removed from this area.

3.4 Diversion of Stream flow from Dredging Area - The Contractor shall provide and maintain, at all times during construction, ample means and devices with which to capture normal streamflow into the reservoir and to divert it from the area of the reservoir to be dredged. The above mentioned pipe shall be used. The contractor shall take proper care to insure that pipe is not damaged during use or transport. The contractor shall install, maintain, and operate piping, and supply, install, maintain and operate all cofferdams, channels, flumes, sumps, pumps and other temporary diversion and protective works needed to divert stream flow and to pass it through the dredging area and dam. Contractor shall provide adequate devices to dissipate energy and prevent scouring and erosion at the outlet of piping.

3.5 Quality Standard –Lakota Lake is classified by the state as a cold water marginal fish life propagation water. (reference 74:51:01:46 in State Rules) The criteria for Total Suspended Solids for this fishery is a 30 day average of less than 90 mg/L and a daily maximum of less than 158 mg/l. This is a state water quality standard which may be monitored by the state.

3.6 Removal of temporary works - When temporary works are no longer needed, the contractor shall remove and return the area to a condition similar to that which existed before construction.

Areas where temporary works were located shall be graded to match adjacent surfaces with no obstruction to natural surface water flows or to the proper functioning of the dam. The contractor shall exercise extreme care during the removal stages to minimize the discharge of soil sediment and debris that was trapped during construction to the stream.

Pipes, casings, and any other material used to dewater the site shall be removed. Dewatering sumps or wells shall be filled to ground level with local soil or other suitable material approved by the contracting officer.

Sediment deposited in sediment basins and trapping devices shall be removed, regarded, seeded, or otherwise disposed of as approved by the Contracting officer.

SECTION 02240

CRUSHED AGGREGATE BASE OR SURFACE COURSE

PART I - GENERAL

1.1 Scope - This item shall consist of preparation of haul road and furnishing, hauling, and placing of 20 C.Y. grading Q aggregate on haul road at approach to the lake.

1.2 Measurement and Payment – Payment shall be at the compacted cubic yard price shown on the schedule of items for Crushed Aggregate Surfacing Grading Q.

1.3 Reference Specifications – The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

AASHTO T11 Materials Finer Than 75-pm (No. 200) Sieve in Mineral Aggregates by Washing Unit Weight and Voids in Aggregate

AASHTO T27 Sieve Analysis of Fine and Coarse Aggregates AASHTO T89 Determining the Liquid Limit of Soils AASHTO T90 Determining the Plastic Limit and Plasticity Index of Soils AASHTO T96 Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine AASHTO T99 The Moisture-Density Relations of Soils Using a 2.5-kg (5.5-lb) Rammer and a 305-mm (12-in) Drop AASHTO T176 Plastic Fines in Graded Aggregates and Soils by Use of the Sand

Equivalent Test AASHTO T210 Aggregate Durability Index

PART II - PRODUCTS

2.1 Materials shall be obtained from an approved commercial source. Crushed aggregate for crushed base or surface courses shall be crushed stone, slag, or gravel meeting the requirements shown in Table 02240-1.

Table 02240-1--Crushed Aggregate Quality Requirements for Base or Surface Courses

Description

AASHTO

Test Method

Requirement Base Surfacing

Percent Wear T96 40 Max. 40 Max.

Durability Index, Coarse & Fine T210 35 Min. 35 Min.

Liquid Limit T89 25 Max. 35 Max.

Plasticity Index T90 6 Max. 2-9 Dust Ratio: % Passing No. 200 T11 2/3 Max. 2/3 Max.

% Passing No. 30 T27 Sand Equivalent T176 35 Min.

02240-1

A. Gradation - The crushed aggregate gradation shall meet the requirements of Table 02240-2 for the grading shown on the drawings or listed in the Schedule of Items. Aggregate shall be well graded from coarse to fine within the gradation band.

Table 02240-2--Crushed Aggregate Grading Requirements for Base or Surface Courses

Percent Passing (AASHTO T11 and T27) Sieve Grading A Grading B Grading C Grading D Grading E 3-Inch 100 2-Inch 65-95 100 1-1/2-Inch 100 1-Inch 60-90 100 3/4-Inch 40-75 60-90 70-98 100 1/2-Inch 44-70 70-98 No. 4 22-45 28-50 30-55 36-60 44-70 No. 8 16-34 20-41 22-43 25-47 30-54 No. 20 8-22 9-26 11-27 12-31 15-34 No. 200 2-10(a) 3-12(a) 3-15(a) 3-15(a) 3-15(a) Sieve Grading F Grading G Grading H Grading J Grading Q 3-Inch 100 100 2-Inch 65-95 100 1-1/2-Inch 100 80-60 1-Inch 50-85 100 3/4-Inch 28-70 55-90 70-98 60-40 1/2-Inch 27-60 No. 4 10-35 15-40 20-48 25-55 No. 8 16-40 No. 30 5-20 6-22 15-45 No. 200 0-10(a) 0-12(a) 0-15(a) 0-15(a) < 20

(a) For untreated base used under bituminous materials specified in Section 02612, the maximum percent passing the No. 200 sieve shall be 8. For surfacing, the minimum percent passing the No. 200 sieve shall be 6.

B. Fractured Faces - When crushed gravel is used, at least 50 percent by weight of the particles retained on No. 4 sieve shall have at least one fractured face. Naturally fractured faces may be included in the 50 percent requirement, provided the roughness and angularity produce strength characteristics equivalent to mechanically fractured faces.

C. Aggregate Certification - The commercial source shall provide a statement from a certified testing facility stating that aggregate from this source meets the requirements of these specifications and the designated gradation. The Contracting Officer may at any time sample the delivered materials and make compliance tests.

02240-2

D. Variance from Specified Requirements - Variances from the crushed aggregate quality and gradation requirements shall be approved in writing by the Contracting Officer prior to use of the material on the project.

3.1 Haul Road Preperation – The following shall apply:

1. The location of the haul route will be staked by the CO.

2. Remove existing picnic table and grill and stockpile on site at location approved by the CO.

3. Construct haul road level to a maximum width of 14’.

4. Smooth out bank at approach to lake and place 20 C.Y. Grading Q aggregate at location and depth approved by the CO.

002240-3

02370 - 1

SECTION 02370

SEDIMENT AND EROSION CONTROL MEASURES

1. PART 1 GENERAL

1.01 SUMMARY

A. The work under this section consists of furnishing all necessary labor, equipment, materials, and performing all operations in connection with construction of sediment and control measures.

B. General

1. Contractor shall submit an erosion control plan 10 days before operations began for CO approval.

2. Contractor shall file Notice of Intent for General Permit for Storm Water Discharges Associated with Industrial or Construction Activities with the State of South Dakota to cover activities on the project.

3. All erosion and sediment control measures are to be placed prior to any disturbance caused by grading and or excavation and shall conform to the requirements of the appropriate regulatory agency for the State.

4. The Contractor shall be solely responsible for ensuring that erosion and sediment control measures are implemented and maintained at the site.

2. PART 2 PRODUCTS

2.01 MATERIALS

A. Synthetic Filter Fabric for silt fences.

1. Pervious sheet of polypropylene, nylon, or polyethylene fabric conforming to the following physical and hydraulic characteristics:

Physical Properties (Min.) Requirement Test Method

Grab Tensile, lbs. W120/F100 ASTM-D-4632 Grab Elongation, % 15 ASTM-D-4632 Mullen Burst, psi 275 ASTM-D-3786 Puncture, lbs. 65 ASTM-D-4833 Trapezoidal Tear, lbs. 50 ASTM-D-4533 UV Resistance, % 80 ASTM-D-4355 AOS, US Sieve # 30/40 ASTM-D-4751 Permittivity gal/min-sq. ft. 90 ASTM-D-4491

02370 - 2

2. Filter fabric should contain ultraviolet ray inhibitors and stabilizers to provide a minimum of 6 months of expected usable construction life at a temperature range of 0 to 120 F.

3. Support Posts: 4 foot - 2 x 2 wood.

B. Straw Bales or straw wattles.

1. Oat or wheat straw, free from weeds, viable weed seeds, foreign matter detrimental to plant life, and dry.

a. Grass hay bales are not acceptable.

b. In order to prevent deterioration of the bindings, all bales shall be either wire-bound or string-tied so that bindings are oriented around the sides rather than along the tops and bottoms of the bales.

3. PART 3 EXECUTION

3.01 CONSTRUCTION

A. Install straw bales or wattles at local drainage ways to prevent silt intrusion upon adjacent drainage courses. Remove straw bales following establishment of vegetation cover and utilize as mulch at swales or on steep slopes.

B. Prior to construction, install silt fence where needed.

C. Maintain and remove all erosion controls as specified.

3.02 SILT FENCE

A. Silt fences are appropriate for the following general locations:

1. Immediately upstream of the point(s) of runoff discharge from a site before flow becomes concentrated. Below disturbed areas where runoff may occur in the form of overland flow.

2. Along the down slope toe of all top soil stock piles.

B. Materials.

1. Utilize standard strength synthetic filter fabric for sediment barriers. The filter fabric shall be purchased in a continuous roll cut to the length of the barrier to avoid the use of joints. When joints are necessary, filter cloth shall be spliced together only at a support post, with a minimum 6 inch overlap, and securely sealed.

2. The standard strength filter fabric shall be stapled or wired to the fence and 6 inches of the fabric shall be extended into the ground. Filter fabric shall not be stapled to existing trees.

3. Support posts shall be spaced at a maximum 6 feet and driven securely into the ground a minimum of 24 inches.

4. The height of a silt fence shall not exceed 36 inches. Higher fences may impound volumes of water sufficient to cause failure of the structure.

02370 - 3

C. Maintenance.

1. Silt fences and filter barriers shall be inspected immediately after each rainfall and at least daily during prolonged rainfall.

2. Silt fences shall be inspected for depth of sediment, tears, and to see if the fabric is securely attached to the fence posts, and to see that the fence posts are firmly in the ground. Any deficiencies shall be repaired immediately.

3. Should the fabric on a silt fence of filter barrier decompose or become ineffective prior to the end of the expected usable life and the barrier still be necessary, the fabric shall be replaced promptly.

4. Sediment deposits should be removed after each storm event and/or when deposits reach approximately 1/3 the height of the barrier or when the sediments limit or prevent the flow of water through the fabric hydraulic.

5. Any sediment deposits remaining in place after the silt fence or filter barrier is no longer required shall be dressed to conform with the existing grade, prepared, and seeded.

3.03 STRAW BALE OR WATTLES EROSION CONTROL FENCE

A. Straw bale erosion control fences are appropriate for the following general locations:

1. Sheet flow applications: Straw bales shall be placed in a single row, lengthwise on the contour with ends of adjacent bales tightly abutting one another.

2. Channel flow applications: Straw bales shall be placed in a single row, lengthwise and oriented perpendicular to the direction of flow with ends of adjacent bales tightly abutting one another. The barrier shall be extended to such a length that the bottoms of the end bales are higher in elevation than the top of the lowest middle bale to assure that sediment laden runoff will flow either through or over the barrier but not around it.

B. The barrier shall be entrenched and backfilled. A trench shall be excavated the width of a bale and the length of the proposed barrier to a minimum depth of 4 inches. After the bales are staked and chinked, the excavated soil shall be backfilled against the barrier. Backfill shall conform to the ground level of the downhill side and shall be built up to 4 inches against the uphill side of the barrier.

C. Each bale shall be securely anchored by at least 2 stakes or rebar driven through the bale. The first stake in each bale shall be driven toward the previously laid bale to force the bales together. Stakes or rebar shall be driven a minimum of 12 inches into the ground or deep enough into the ground to securely anchor the bales, whichever is greater.

D. The gaps between bales shall be chinked (filled by wedging with straw to prevent water from escaping between the bales). Loose straw scattered over the area immediately uphill from a straw bale barrier tends to increase barrier efficiency.

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3.04 MAINTENANCE.

A. Inspection shall be frequent and repair or replacement shall be made promptly as needed.

B. Straw bale carriers shall be removed when they have served their usefulness, but not before the upslope areas have been permanently stabilized.

SECTION 02825

SEEDING AND MULCHING

PART I - GENERAL

1.01 Scope – Perform all work necessay to seed and mulch disturbed areas.

1.02 Measurement and Payment – Payment shall be at the lump sum price shown on the schedule of items. Such payment shall be full compensation for furnishing and spreading the seed and for furnishing and installing the erosion control mat.

PART II - PRODUCTS

2.01 Requirements - Materials shall meet the requirements of the following:

A. Seed: 100 pounds required

1. Seed shall be noxious weed free, and the certificate stating this shall be given to the CO. Species of seed for the mixes shall be thoroughly and uniformly mechanically machine mixed. A label shall be attached to each bag of seed stating the name and address of shipper, the weight, kind, variety, purity, germination, hard seed, source of origin, date of last tests, lot #, prohibited noxious weeds, restricted noxious weeds, inert material, other crop, other weeds seeds and whether the seeds are treated and with what substance (if applicable). Application rate shall be 20 lbs/acre.

Kind of Seed lbs/ac. Live Seed

Canada Wildrye 6 100 Slender Wheatgrass 5 100 Prairie Junegrass 1 100 Annual Ryegrass 2 100 Western Wheatgrass 6 100

TOTAL 20 lbs 100%

Mix must be free of Cheatgrass (Bromus Tectorum)

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B. Mulch: 100 square yards required

a. Erosion Control Blanket shall be biodegradable blanket composed of natural or polymer fibers mechanically, structurally or chemically bound together to form a continuous matrix to provide erosion control and facilitate vegetation establishment. Blanket shall be North American Green S1000 BD or approved equal installed as per manufacturer’s recommendations.

b. Fasteners to hold blanket in place shall be biodegradable available at North American Green.

PART III - EXECUTION

3.01 Application Method - The Contractor shall use the following application method.

Dry Method: Hand powered mechanical seeders, seed drills, or other approved equipment may be used to apply seed in a dry form. Riding power equipment shall not be used.

3.02 Seeding - The seed or seed mixture shall be accurately proportioned as stipulated and thoroughly mixed. It shall be remixed as necessary so that a uniform mixture will result as each loading of the seeder is made. The area to be seeded shall be approved by the CO.

3.03 Installation of Netting & Erosion Control Blankets - Erosion control blankets shall be installed on rehabilitated access road from lake to the disposal site.

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